Quick help! - Regex for splitting a string

Hello,
I want to split the string in following manner. Here are my strings for example:
-----
"Hello this is a string.-2.34 This is an example1 string."
"Hello this is another string.3.53 This is an example2 string."
-----
Please note that "" is a U+F8FF unicode character.

I want to have 3 broken parts of the string:
"Hello this is a string.","-2.34"," This is an example1 string."
"Hello this is another string.","3.53","This is an example2 string."

I have written a regex to split the string but using this I cannot get the numeric part that I want. (-2.34 in first string)
---------
My code:
------------------------
import re
import os
from django.utils.encoding import smart_str, smart_unicode